Description of Terminating – Trunk Segments, Transmission Link and Connected Circuit Services
Terminating Segment : A Terminating Segment is a digital technology circuit that links an LL Client to the nearest (overlying) LLCN or L/E which the LL Client belongs (the Telecommunications Service Provider’s client or the Telecommunications Service Provider itself), in accordance with the OTE network architecture.
In order to deliver Terminating Segments to the Telecommunications Service Provider at the LLCN or the L/E, these can either be multiplexed to one Transmission Link (Full Span, In Span or P/C Physical Collocation), or can be linked to a Terminating or/and Trunk Segment (Coupled Circuit) of the same capacity.
Terminal Segments are available as digital circuits at the following speeds: 64 kbit/s, 128 kbit/s, 256 kbit/s, 384 kbit/s, 512 kbit/s, 1024 kbit/s, 1920 kbit/s, 2 Mbit/s, 34 Mbit/s, 45 Mbit/s, 155 Mbit/s and 622 Mbit/s.
Trunk Segment : A Trunk Segment is a circuit starting in the multiplexing area of an LLCN and ending in the multiplexing area of another LLCN, and it is provided only between the 45 LLCNs.
To deliver a Trunk Segment to the Telecommunications Service Provider at the LLCN, it is multiplexed and integrated at each end respectively in a Transmission Link (Physical Collocation or Full Span or In Span).
Or it can be linked (Coupled Circuit): To a Terminating at one end ( Terminating Segment – Trunk Segment), or
at both ends to two terminating segments respectively (Terminating – Trunk – Terminating Segment).
Trunk Segments are digital circuits available at the following speeds: 64 kbit/s, 128 kbit/s, 256 kbit/s, 384 kbit/s, 512 kbit/s, 1024 kbit/s, 1920 kbit/s, 2 Mbit/s, 34 Mbit/s, 45 Mbits, 155 Mbit/s and 622 Mbit/s
Connected Circuits : A Connected Circuit comprises Terminating or/and Trunk segments and falls necessarily within one of the following groups:
• A Terminating Segment linked to another Terminating Segment at an L/E or LLCN level, where both ends of such segments are linked at one common point (one common end).
• A Terminating Segment linked to a Trunk Segment at an LLCN level, where both ends of such segments are linked at one common point (one common end).
• A Trunk Segment linked on both sides to two Terminating Segments at an LLCN level. Each Trunk Segment has a common connection point with 2 Terminating Segments, links as its ends .
Connected Circuits set up an end-to-end network and are necessarily of the same speed.
Transmission Link: It pertains to the additional service (related facility) used for delivering terminating and trunk segments of Wholesale Leased Lines to a Telecommunications Service Provider. It is defined as the link between the Provider’s Point of Presence (PoP) or network and the OTE network LLCN or L/E. Transmission Links are provided at the OTE 45 LLCNos and 202 L/Es.
The types of Transmission Links are as follows:
Full Span Transmission Link
In Span Transmission Link
P/C (Physical Collocation) Transmission Link
Full Span Transmission Link : A symmetrical line of dedicated capacity whose one end is located at an LLCN or L/E and another end is located at the Provider's facilities (Provider’s Point of Presence - PoP).
A Full Span Transmission Link can comprise the following:
i) A Terminating Segment
ii) A Terminating Segment + a Trunk Segment
iii) A Terminating Segment + a Trunk Segment + an Extension Terminating Segment *
iv) A Terminating Segment + an Extension Terminating Segment *
* An Extension Terminating Segment (ETS) is a segment that links the Local Exchange (L/E) where the P/C is located to the nearest (overlying) Leased Line Trunk Node (LLCN) or L/E in accordance with the OTE transmission network structure as described in the relevant reference Wholesale Leased Line Trunk Segment Offer. An Extension Terminating is part of a Full Span Link and is not provided as an independent circuit. It is available at the following capacities: 2 Mbit/s, 34 Mbit/s, 45 Mbit/s, 155 Mbit/s and 622 Mbit/s.
In Span Transmission Link : A symmetrical line of dedicated capacity whose one end is located in the multiplexing area of an LLNo or L/E and another end is the optical connector inside the Provider Reception Manhole (PRM) located close to the OTE LLCN or L/E.
It is available at the following capacities: 34 Mbit/s, 155 Mbit/s and 622 Mbit/s.
Physical Collocation Transmission Link : It is a symmetrical circuit of a dedicated capacity whose one end is located in the multiplexing area of an LLCN or L/E and another end reaches the optical distributor inside the P/C area located inside the LLCN or L/E in question.
It is available at the following capacities: 2 Mbit/s, 34 Mbit/s, 45 Mbit/s, 155 Mbit/s and 622 Mbit/s.